What are the Best Ways to Sum the Elements of a std::vector in C ?

Alternative Methods for Summing Elements of a std::vector

Finding the sum of all elements in a std::vector is a common task with multiple efficient approaches. Here are several options:

Classic C 03 Techniques

For Loop:

int sum_of_elems = 0;
for (std::vector<int>::iterator it = vector.begin(); it != vector.end(); ++it)
     sum_of_elems += *it;

Standard Algorithm:

#include <numeric>

sum_of_elems = std::accumulate(vector.begin(), vector.end(), 0);

Note: Be aware that the type of the last argument determines the result type.

Modern C Approaches (C 11 )

Automatic Type Handling:

#include <numeric>

sum_of_elems = std::accumulate(vector.begin(), vector.end(),
                                decltype(vector)::value_type(0));

std::for_each:

std::for_each(vector.begin(), vector.end(), [&](int n) {
     sum_of_elems += n;
});

Range-Based For Loop:

for (auto& n : vector)
     sum_of_elems += n;

C 17 Enhancements

std::reduce:

#include <numeric>

auto result = std::reduce(v.begin(), v.end());

std::reduce handles result type inference and offers parallel execution capabilities for large collections.

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